- FAIRBANKS, Alaska (AP) - A University of Alaska Fairbanks professor is disputing the claim that this year's Nenana Ice Classic culminated with the latest river breakup in its 97-year history. The Tanana River ice moved at 3:41 p.m. Monday. The game of guessing when the ice will move officially uses standard time, not daylight time, so the winning time was listed as 2:41 p.m., breaking the record of 11:41 a.m. AST set May 20, 1964. The Fairbanks Daily News-Miner says forest ecology professor Glenn Juday notes that 1964 was a leap year. That means the ice moved on the 141st day, compared with the ice moving this year on the 140th day. Ice classic manager Cherrie Forness says leap year doesn't matter because the game goes by the Gregorian, not Julian, calendar.